<template>
  <div class="about">
    <el-card>
      <h1>{{id?"编辑":"新建"}}分类</h1>
    <el-form label-width="120px" @submit.native.prevent="save">
      <el-form-item label="上级分类">
        <!-- 使用select获取分类名name和该分类的id,后期如果修改分类名自动更新子分类的上级分类 -->
    <!-- 其中label获取分类名，发送到数据库的值为该分类的id————以id为分类寻找依据 -->
        <el-select v-model="model.parent">
          <el-option v-for="item in parents" :key="item._id"
          :label="item.name" :value="item._id"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="名称">
        <el-input v-model="model.name"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" native-type="submit">保存</el-button>
      </el-form-item>
    </el-form>
    </el-card>
  </div>
</template>

<script>
export default {
  props: {
    id: {}
  },
  data(){
    return {
      model: {},
      parents: []
    }
  },
  methods: {
    async save() {
      let res
      if(this.id) {
        res = await this.$http.put(`rest/categories/${this.id}`, this.model)
      } else {
        res = await this.$http.post("rest/categories", this.model); //eslint-disable-line no-unused-vars
      }
      this.$router.push("/categories/list");
      this.$message({
        type: "success",
        message: "保存成功"
      });
    },
    async fetch() {
      const res = await this.$http.get(`rest/categories/${this.id}`)
      this.model = res.data
    },
    async fetchParents() {
      const res = await this.$http.get("rest/categories")
      this.parents = res.data
    }
  },
  
  created() {
    this.fetchParents()
    this.id && this.fetch()
  }
};
</script>

<style>
</style>